Telephone apparatus.



N0. 64|,569. Patented Ian. I6, 1909. D. H. WILSGN.

TELEPHONE APPARATUS. (Application filed Jan. 29, 13

(No Model.) 3' Sheets-Sheet Ihvdaio 2' No. 64l,569. Patented Jan. I6,1900. D. H. WILSON.

TELEPHONE APPARATUS.

(Application filed Jan. 29, 1898.)

(No Model.)

3 sheets-Sheet 2 Patented Jan. l6 D. H. WILSON.

TELEPHONE APPARATUS.

(Application filed Jan. 29, 1898.)

M N N 3 Sheets-Sheet 3 (N0 MOGGL) 71 2271, es; ea

ma "cams PETERS co PHOTO-LITHQ, VIASHVNGTON, o. c.

Q NITED STATES PATENT Enron.

DAVID H. WILSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO .IAY MORTON, OF SAMEPLACE.

TELEPHONE APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 641,569, dated January16, 1900.

Application filed January 29, 1898. Serial No. 668,368. (No model.)

To all whom it may concern:

Be it known that 1, DAVID LLWILsoN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois,

have invented a certain new and useful Improvement in TelephoneApparatus, of which the following is a specification.

My invention relates to telephone apparatus, and has for its object toprovide a new IO and improved telephone apparatus, of which thefollowing is a description, reference being had to the accompanyingdrawings,where- 1n- Figure 1 is a View of the apparatus at one end ofthe line in position. Fig. 2 is a diagrammatic View showing theconnecting-circuits of the system. Fig. 3 is asectional View through thetransformer. Fig. 4 is a detail showing one form of connecting a crankto the core of the coils of the transformer.

Like letters refer to like parts throughout the several figures.

In Fig. 1 I have shown the instruments at one end of the line inposition upon the table or stand A, such instruments consisting of thetransmitter B, the receiver 13, the transformer O, and the signal orbell D. The transformer 0 consists of a permanent magnet provided withopposed pole-pieces O 0, between which is mounted the core E, uponwhich, for

example, are wound the primary and secondary coils E F. (See Fig. 3.)The core E and the primary and secondary coils E F are preferablyrotatably mounted in any convenient 3 5 manner, and the ends of theprimary coil are connected with the commutator E on the shaft Econnected with the core of the coil, and are connected in circuit withthe source of electric supply G by the brushes E E (See Fig. 2.) Theends of the secondary coil are connected with the collecting-rings F Fon the shaft E said rings being connected in circuit by means of thebrushes F F The shaft E is provided with the crank H, which is rotatablymounted upon the shaft, (see Fig. 3,) said shaft being provided with theratchet-wheel H, adapted to be engaged by the pawl H connected with thecrank H. By this construction the primary and secondary 5o coils may berotated manually or otherwise by applying power to the crank H. It willalso be seen that the said coils may be rotated independent of the crankH. The construction for this purpose is shown in Fig. 2, wherein thebrush E is connected with the conductor I, associated with the contactI, said conductor being connected by the conductor I with the contact 1opposed to the contact I on the switch-arm I. The contact I is connectedby the conductor I with the source of electric supply G, said source ofelectric supply being connected by the conductor I with the brush E. Itwill thus be seen that by moving the switch-arm I the circuit throughthe primary coil may be completed, thus causing a rotation of thearmature. The switcharm I is also connected by the conductor J with thereceiver B. The receiver is also connected with the contact K on thereceiverhook K, said contact being opposed to the contact K connectedwith the main line K The'transmitter is connected with the source ofelectric supply G by the conductor L and with the contact L on thereceiver-hook by the conductor L The switch-arm I is connected with thecontact M, associated with the receiver-hook, by means of the conductorM. The brush F associated with the secondary coil, is connected by theconductor N with the signal D, and the brush F is connected by theconductor N with the conductor J I have shown in detail a particularconstruction of the several parts herein shown; but it is of courseevident that these several constructions may be greatly varied in form,construction, and arrangement and that some of the parts herein shownmay be omitted and others used in connection with the parts not shownwithout departing from the spirit of my invention, and I therefore donot wish to be limited by the construction shown and described.

The use and operation of my invention are as follows: If it is desiredto ring up a party 5 with whom itis desired to speak, the switcharm I ismoved so as to engage the contacts I and J. A circuit is then completedthrough the primary coil, which may be traced as follows: from thesource of electric supply G, through conductor 1, contacts I 1 conductorI conductor I, brush E primary-coil brush E conductor 1 and back to thesource of electric supply G. This current in the primary coil causes arotation of both the primary and secondary coils and the core to whichthey are attached. An alternating current is then conductor N conductorJ switch-arm I conductor M, contact M, main line K to the bell of thecalled party,thence through ground and back through bell D and conductorN to the secondary coil. \Vhen the bell is operated in this manner, thecrank-arm H remains stationary, while the shaft to which itis attachedrotates with the primary and secondary coils. If it is desired to ringthe bell manually, the primary and secondary coils are rotated by meansof the crank H,thus generating an alternating current in the secondarycoil, .the current being traced as above described. When it is desiredto talk, the receiver is removed from the hook, said hook being moved byits retracting-spring so as to close the circuit between contacts K andK and L and I and break the contact between the contact M and thereceiver-hook. The circuit through the primary coil is then completedand will be traced as follows: from the source of electric supply G,through conductor L, transmitter 'mitter produces a current in thesecondary coil which is traced as follows: from thesecondary coil,through brush F conductor N, conductor J receiver B, contacts K K, tomain line K thence through the other instrument, and thence throughground and back to the secondary coil.

I have found that by the use of the transformer herein shown I amenabled to produce results which cannot be produced in the ordinarytelephone, one result being that the combination of the parts allows meto talk through great resistance with comparative ease.

I claim- 1. The combination in a telephone system of a transformerprovided with a primary and secondary coil wound upon a core, apermanent magnet provided with opposed polepieces between which the coreof the said coils is interposed so as to form part of the magneticcircuit of said permanent magnet, a transmitter, a receiver, andsuitable electrical connections whereby the transformer, transmitter andreceiver are connected in circuit.

2. A telephone system comprising a transformer, consisting of a core ofmagnetic material provided with two separate coils-wound one on top ofthe other, a permanent magnet provided with opposed pole-pieces, saidcore of magnetic material being movably mounted between said pole-piecesso as to form part of the magnetic circuit of the permanent magnet, atransmitter, a receiver, an alarm device, and suitable electricalconductors connecting the parts in circuit;

3. A transformer for telephone-circuits and the like, comprising apermanent magnet having opposed pole-pieces, two separate coils, one aprimary coil and the other a secondary coil, wound upon a core ofmagnetic material,said core and coils mounted between said opposedpole-pieces so as to form part of the magnetic circuit of the permanentmagnet.

4. A transformer for telephone circuits and the like, comprising apermanent magnet formed with opposed polepieces, two separate coilswound upon a core of magnetic material, said core and coils movablymounted between said opposed pole-pieces so as to form part of themagnetic circuit of the permanent magnet, means for connecting one ofsaid circuits witha telephone-circuit and the other with a source ofelectric supply, and a switch interposed between the source of electricsupply and the coil connected therewith.

5. The combination in a telephone system of a transformer, consisting ofa core of magnetic material having two separate coils wound thereon,apermanent magnet provided with opposed pole-pieces between which saidcore and coils are rotatably mounted so as to form part of the magneticcircuit of the permanent magnet, a transmitter adapted to be connectedin circuit with one of said coils, an alarm device adapted to beconnected in circuit with the other coil, a receiver also adapted to beconnected in circuit with said latter coil, and means associated withthe circuits so that the alarm device may be connected in a circuitincluding said latter coil either with or without said receiver.

6. The combination in a telephone system of a transformer consisting ofa core of mag netic material having two coils wound thereon, a permanentmagnet provided with opposed pole-pieces, between which said core andcoils are rotatably mounted so as to form part of the magnetic circuitof the permanent magnet, one of said coils adapted to be connected withthe source of electric supply and a telephone-transmitter, the othercoil adapted to be connected with an alarm device and atelephone-receiver, and means for rotating both of said coils when thealarm is in circuit so as to generate a current in one of the coils andactuate the alarm device.

7. A transformer, comprising a permanent magnet-having separated andopposed polepieces, two separate coilsof difierent-sized wire wound upona suitable core, one acting as a primary coil and the other as asecondary coil, said core and coils movably mounted between said opposedpole-pieces, so as to form part of the magnetic circuit of the permanentmagnet, and means for connecting said respective coils with a primaryand a secondary circuit.

DAVID I-I. \VILSON.

lVitnesses:

DONALD M. CARTER, HOMER L. KRAFT.

